can't read "dir": no such variable
    while executing
"file join $dir map_slippy.tcl"
    (in namespace eval "::request" script line 2)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
if {![package vsatisfies [package provide Tcl] 8.4]} {return}
package ifneeded map::slippy             0.5 [list source [file join $dir map_slippy.tcl]]
package ifneeded map::slippy::fetcher    0.4 [list source [file join $dir map_slippy_fetcher.tcl]]
package ifneeded map::slippy::cache      0.2 [list source [file join $dir map_slippy_cache.tcl]]
package ifneeded map::geocode::nominatim 0.1 [list source [file join $dir map_geocode_nominatim.tcl]]